linux-kernel - Re: [PATCH 4/14] powerpc/pseries: delete unneeded test before of_node

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Date:	Mon, 11 Aug 2014 12:57:18 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	kernel-janitors@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 4/14] powerpc/pseries: delete unneeded test before
 of_node_put

On Fri, 2014-08-08 at 12:07 +0200, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@...6.fr>
> 
> Of_node_put supports NULL as its argument, so the initial test is not
> necessary.
> 
> Suggested by Uwe Kleine-König.
> 
> The semantic patch that fixes this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression e;
> @@
> 
> -if (e)
>    of_node_put(e);
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

> 
> ---
>  arch/powerpc/platforms/pseries/iommu.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
> index 33b552f..2ea6831 100644
> --- a/arch/powerpc/platforms/pseries/iommu.c
> +++ b/arch/powerpc/platforms/pseries/iommu.c
> @@ -575,8 +575,7 @@ static void pci_dma_bus_setup_pSeries(struct pci_bus *bus)
>  	while (isa_dn && isa_dn != dn)
>  		isa_dn = isa_dn->parent;
>  
> -	if (isa_dn_orig)
> -		of_node_put(isa_dn_orig);
> +	of_node_put(isa_dn_orig);
>  
>  	/* Count number of direct PCI children of the PHB. */
>  	for (children = 0, tmp = dn->child; tmp; tmp = tmp->sibling)
> 
> --
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